‘There’ll be time for rest later,’ I said, watching the Druid shuffle off into the dark.

Morwenna put her arms around me and rested her head on my shoulder. She had hair as golden as Ceinwyn’s had been, and it smelt like Ceinwyn’s. ‘Maybe it isn’t a magic at all,’ she said. ‘If it weren’t magic,’ I said, ‘then she would have died.’ ‘There’s a woman in Powys who is said to have great skills.’ ‘Then send for her,’ I said wearily, though I had no faith in any sorcerers now. A score had come and taken gold, but not one had lifted the sickness. I had sacrificed to Mithras, I had prayed to Bel and to Don, and nothing had worked.

Ceinwyn moaned, and the moan rose to a scream. I flinched at the sound, then gently pushed Morwenna away. ‘I must go to her.’

‘You rest, father,’ Morwenna said. ‘I’ll go to her.’

It was then that I saw the cloaked figure standing in the centre of the courtyard. Whether it was a man or a woman I could not tell, nor could I say how long the figure had stood there. It seemed to me that only a moment before the courtyard had been empty, but now the cloaked stranger was in front of me with a face dark shadowed from the moon by a deep hood, and I felt a sudden dread that this was death appearing. I stepped towards the figure. ‘Who are you?’ I demanded.

‘No one you know, Lord Derfel Cadarn.’ It was a woman who spoke, and as she spoke she pushed back the hood and I saw that she had painted her face white, then smeared soot about her eye sockets so that she looked like a living skull. Morwenna gasped.

‘Who are you?’ I demanded again.

‘I am the breath of the west wind, Lord Derfel,’ she said in a sibilant voice, ‘and the rain that falls on Cadair Idris, and the frost that edges Eryri’s peaks. I am the messenger from the time before kings, I am the Dancer.’ She laughed then, and her laughter was like a madness in the night. The sound of it brought Taliesin and Galahad to the door of the sickroom where they stood and stared at the white-faced laughing woman. Galahad made the sign of the cross while Taliesin touched the iron latch of the door. ‘Come here, Lord Derfel,’ the woman commanded me, ‘come to me, Lord Derfel.’

‘Go, Lord,’ Taliesin encouraged me, and I had a sudden hope that the lice-ridden Druid’s spells might have worked after all, for though they had not lifted the sickness from Ceinwyn, they had brought this apparition to the courtyard and so I stepped into the moonlight and went close to the cloaked woman.

‘Embrace me, Lord Derfel,’ the woman said, and there was something in her voice that spoke of decay and dirt, but I shuddered and took another step and placed my arms around her thin shoulders. She smelt of honey and ashes. ‘You want Ceinwyn to live?’ she whispered in my ear.